9 March 2018 Influence of data completion on scatter artifact correction for truncated cone-beam CT data
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X-ray scatter leads to one of the major artifacts limiting the image quality in cone-beam CT (CBCT). Hence the interest to perform an accurate scatter correction is very high. A particularly large amount of scatter is created in CBCT, due to the large cone-angle and the small distance between the rotation axis and the detector. Even if an anti-scatter grid is used, a scatter correction is necessary. The performance of an accurate scatter correction is difficult, especially when the data are additionally truncated due to a small field of measurement (FOM) (e.g. dental CT systems or C-Arm CT systems). In addition to the image degradation due to scatter artifacts, numerous CBCT artifacts like beam-hardening artifacts and cone-beam artifacts contribute to a further reduction in image quality. In this paper different detruncation methods are compared with respect to scatter to find a quantitative scatter correction approach for truncated CBCT data. The evaluation shows that a precise detruncation is crucial for an appropriate scatter correction. Additionally, the general image quality limit is enhanced by performing further artifact correction methods to reconstruct a nearly artifact-free CBCT volume.
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Nadine Waltrich, Nadine Waltrich, Stefan Sawall, Stefan Sawall, Joscha Maier, Joscha Maier, Jan Kuntz, Jan Kuntz, Kai Stannigel, Kai Stannigel, Kai Lindenberg, Kai Lindenberg, Marc Kachelrieß, Marc Kachelrieß, } "Influence of data completion on scatter artifact correction for truncated cone-beam CT data", Proc. SPIE 10573, Medical Imaging 2018: Physics of Medical Imaging, 1057349 (9 March 2018); doi: 10.1117/12.2292198; https://doi.org/10.1117/12.2292198

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